Description of problem:
SELinux is preventing ps from 'sys_ptrace' accesses on the cap_userns Unknown.

*****  Plugin catchall (100. confidence) suggests   **************************

If you believe that ps should be allowed sys_ptrace access on the Unknown cap_userns by default.
Then you should report this as a bug.
You can generate a local policy module to allow this access.
Do
allow this access for now by executing:
# ausearch -c 'ps' --raw | audit2allow -M my-ps
# semodule -X 300 -i my-ps.pp

Additional Information:
Source Context                system_u:system_r:mdadm_t:s0-s0:c0.c1023
Target Context                system_u:system_r:mdadm_t:s0-s0:c0.c1023
Target Objects                Unknown [ cap_userns ]
Source                        ps
Source Path                   ps
Port                          <Unknown>
Host                          (removed)
Source RPM Packages           
Target RPM Packages           
Policy RPM                    <Unknown>
Selinux Enabled               True
Policy Type                   targeted
Enforcing Mode                Enforcing
Host Name                     (removed)
Platform                      Linux (removed) 4.12.5-300.fc26.x86_64 #1 SMP Mon
                              Aug 7 15:27:25 UTC 2017 x86_64 x86_64
Alert Count                   2
First Seen                    2017-08-27 01:00:08 CEST
Last Seen                     2017-08-27 01:00:08 CEST
Local ID                      c1d25ddc-eca3-43b2-a8b6-49bc76337f5e

Raw Audit Messages
type=AVC msg=audit(1503788408.471:1313): avc:  denied  { sys_ptrace } for  pid=30791 comm="ps" capability=19  scontext=system_u:system_r:mdadm_t:s0-s0:c0.c1023 tcontext=system_u:system_r:mdadm_t:s0-s0:c0.c1023 tclass=cap_userns permissive=0


Hash: ps,mdadm_t,mdadm_t,cap_userns,sys_ptrace


Additional info:
component:      selinux-policy
reporter:       libreport-2.9.3
hashmarkername: setroubleshoot
kernel:         4.13.13-300.fc27.x86_64
type:           libreport

Potential duplicate: bug 1377035